encryption - How do I quickly encrypt a file with AES
For example, a single invocation of the AES algorithm transforms a 128-bit plaintext block into a ciphertext block of 128 bits in size. The key, which is given as one input to the cipher, defines the mapping between plaintext and ciphertext. If data of arbitrary length is to be encrypted, a simple strategy is to split the data into blocks each (C#) openssl enc decrypt. Demonstrates how to decrypt a file that was encrypted using "openssl enc". This example shows how to decrypt what was created using this openssl command: openssl enc -e -aes-256-cbc -in hamlet.xml -out hamlet.enc -pass file:./secret.txt This example shows how to do this: Cipher: AES-256-CBC MAC: SHA-512 Method: Encrypt-then-MAC. I am working on an Ubuntu Bionic and I have root acceess. 1.) Which would be the simplest setup to do this? Is this with openssl possible? I read tutorials for encryption and decryption with openssl, but are the specifications above possible with openssl? 2.) $ openssl aes-256-cbc -e-in rawtext.txt -out encrypted.txt enter aes-256-cbc encryption password: # パスワード入力 Verifying - enter aes-256-cbc encryption password: # もう一度 パスワードをファイルから読み込む場合 A worse problem is the way the key is derived from the password: openssl enc uses a single round of MD5, which is bad — deriving a key from a password should use an intrinsically slow function (a key stretching function) to slow down brute force cracking attempts where the attacker tries likely passwords (dictionary words, 1337 variations, etc.).
May 06, 2020
OpenSSL AES CBC 256 in .NET for interop with Ruby. GitHub Gist: instantly share code, notes, and snippets.
Implementation of AES-256-CBC Cryptographic Encryption Kernel
A 6 Part Introductory OpenSSL Tutorial - KeyCDN